> Why should the fake accounts team care about the metrics of the ads team?
Ok, now I understand what you meant. In this case it's because the strategy comes from high up and (putting plausible deniability of individuals like FB's CEO aside) the manager of the "fake accounts" team got some instructions from above to focus "here" not "there", and this just happens to be in the best interest of the "ads" team.
The employees themselves may be individuals but they're there working for the vision of the company and CEO (because it's usually the CEO who sets the course and is aware of all these directives). They're not doing it for the other team, they're doing it because whoever set the strategy decided it's in the best interest of the company.
Both? We don't live in a binary world my friend. They are removing some fake accounts and not others. I have worked in plenty of companies who were doing such a selective job (I'd say all companies do this when it comes to defending their interests) to know this isn't at all far fetched.
Some departments are routinely instructed to turn a blind eye to the actions of some but not others. Sexual harassment is one topic that rubs me the wrong way since I worked (and quit from) companies who were pursuing these cases only if they were below a certain level in the hierarchy. Above that it was "blind eye" all around.
Ok, now I understand what you meant. In this case it's because the strategy comes from high up and (putting plausible deniability of individuals like FB's CEO aside) the manager of the "fake accounts" team got some instructions from above to focus "here" not "there", and this just happens to be in the best interest of the "ads" team.
The employees themselves may be individuals but they're there working for the vision of the company and CEO (because it's usually the CEO who sets the course and is aware of all these directives). They're not doing it for the other team, they're doing it because whoever set the strategy decided it's in the best interest of the company.